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Abstract

We show an improved DPSK receiver design which can increase useful dispersion tolerance by up to a factor of two. The increased dispersion tolerance is achieved through optimization of the optical filter at the receiver and the delay of the Mach-Zehnder interferometer. In this paper we fully explain the concept, quantify the gain and provide an explanation for the operation of the receiver.

Q-value as a function of dispersion for the receiver in Fig. 1 and 42.7GB/s transmission. The dotted lines are for a 1 bit delay and a 50GHz filter bandwidth and the solid lines for optimized delay and filter bandwidth the % refer to the RZ mark-to-space ratio.

Filter bandwidth and MZI delay as function dispersion. MZI delay is given with the solid lines and is related to the axis on the right; filter bandwidth is the dashed line and is related to the axis on the left. Both 50% RZ and 67% RZ results are given.

Q penalty at the receiver as a function of MZI delay. The solid line represents the PDPSK with no dispersion the short dashed line is the same with dispersion and the horizontal line represents a 3dB penalty.